Philosophy, Logic, and Myth: The "Presocratics"

We know how to speak much that is false but seems like the truth, and, if we like, we also know how to speak the things that are true.


Presocratics and the sophos tradition: mythos, logos


Hesiod

Constructs a "system" to myth using elements of genealogy as his building blocks


Parmenides (end of sixth, beginning of fifth century B.C.)

A radical application of early logic to derive an intelligible world divorced from the senses, seeking "truth" through pure reason

The way of truth (=the intelligible world, the really real, what we know must be through logical deduction)

The way of opinion (=the perceptible world, the false world that seems to be true to our (faulty) sense perceptions)

Summary: Parmenides began by considering the possible subjects of inquiry: you can inquire into what exists, or you can inquire into what does not exist. But in fact the latter is not a genuine possibility: for you cannot think of, and hence cannot inquire into what does not exist. So every subject of inquiry must exist. But everything that exists must, as Parmenides proceeds to argue, possess a certain set of properties: it must be ungenerated and indestructible (otherwise it would, at some time, not exist -- but that is impossible!); it must be continuous, without spatial or temporal gaps; it must be entirelly changeless-- it cannot move or alter or grow or diminish; and it must be bounded or finite, like a sphere. Reason, the logical power of unavoidable deduction, shows that Reality, what exists, must be so: if sense perceptions suggest a world of a different sort, so much the worse for sense perceptions!


Empedocles (early fifth century B.C.)

Summary: Empedocles insisted, against Parmenides and his followers, that the senses, if properly used, could be routes to knowledge. He agreed with Parmenides' proof that nothing could really come into existence or perish, and thus posited a world in which the stuff of the universe, which was unchanging in its sum, continually moved and intermingled in its parts, thus effecting the changes that we observe. He thereby solves the paradox of an unchanging world (that is, the sum of its parts cannot change, by logic, since nothing can be really created or destroyed) that seems, to our senses, to change constantly.

The universe, according to Empedocles, is made up of 4 elements: air, earth, fire, and water. These four elements are continually coming together and breaking apart because of warring natural powers of attraction and repulsion, which he calls "Love" and "Strife". Change in the universe is cyclical, so that now Love, now Strife, dominates. Under the power of Love, all elements come together into a unity, a homogeneous sphere. As Strife regains power, the sphere breaks up, the elements separate and intermingle, and our familiar world begins to separate out into its familiar forms. Then the process reverses itself: from the articulated world, through several stages, the elements recombine back into the homogeneous sphere. This cycle repeats indefinitely.


Philosophy, Logic, and Myth: Socrates and Plato

Socrates - Plato - Aristotle


The Sophists


Socrates, 469-399 B.C.


Plato, 427-349 B.C.


[Aristotle: 384-322]